Spindle reciprocating mechanism



Ma 11,1943; EPHCE A 2,318,799

SPINDLE RECIPROCATING MECHANISM Filed June 23, 1941 2 Sheeis-Sheet l I 3m entor RALPH '5. PRICE X BB l/mEoLp E. BALLS/Q58 wheel base of the application Serial No.

Patented May 11 i943 SPINDLE arsorrnocsrms MECHANISM Ralph E. Price, Highfield. Ma, and Harold E.

'Balslger, waynesboro, Pa.,

assignors to Landis 6 Tool Company, Waynesboro, Pa.

Application June 23, 1941, Serial No. 399,358 (Ci. 514 4) 7Claims.

This invention relates to metal working machines, particularly grinding machines, and it is an object thereof to provide a spindle mounting whereby-a grinding wheel on the spindle may be reciprocated thru a stroke of adjustable length within a predetermined range.

A further object is to rocating mechanism to effect endwise movement of said spindle.

A further object is to provide resilient means for taking up wear on the thrust member.

provide a novel recip- A further object is to provide means whereby the same resilient member is used for eflecting a part of the reciprocating movement of the grinding wheel.

A further object is to provide manually operated means for shifting said spindle and grinding wheel to grind against a shoulder.

Inorder to prevent endwise movement of a grinding wheel spindle, ashoulder thereon is usually held against one end of a bearing member by means of a thrust nut on said. spindle at the opposite end of said bearing. As the shoulder or nut wears away due to the rotation of the spindle, the wear maybe taken up by ad lusting said nut. By substituting a spring for the nut and inserting same between the spindle pulley and the bearing, wear-will be taken up automatically. If it is desired to grind against a shoulder or to reciprocate the spindle, this spring can be used direction.

A reciprocating mechanism has also been provided which consists of an annular faced cam to provide movement in one rotating inside the spindle in the same directionas the spindle but at a slightly diflerent speed. Said cam urges said spindle to the left thru a single ball in an annular race in said-spindle.v

The thrust take-up spring urges said spindle in the opposite direction.

Figure 1 is a sectional front view of a grinding wheel support showing a fixed stroke reciprocating mechanism.

end elevation of the starting Figure 2 is an knob.

Figure 3 is a sectional view of an adjustable reciprocating mechanism.

Figure 4 is a sectional view oithe device of Figure 3 in a non-reciprocating position.

Figure 5 is an end view 01' the adjusting means in Figure 3.

Figure 6 is an alternate form of our invention. 4

In the drawings, numeral I is a grinding type disclosedin copending 321,310 flied February 28,

-I may be locked to said 1940; II and I2 spindle bearings mounted therein, i3 a spindle rotatably supported in said bearings, and II a thrust shoulder on said spindle. Said shoulder is held against one end of bearing l2 by a spring ii at the opposite end thereof. One end 01' said spring bears against a thrust collar I 6 which in turn bears against the end of said bearing. Said collar is held against rotation relative to the spindle by a pin I1 therein which projects into groove ill in spindle iii. The other end of spring l5 bears against a pulley i3 keyed to said spindle and secured thereon by a nut 20. A driving pulley 2! may be mounted in any suitable manner on a motor or line shaft (not shown) and connected to pulley I3 by V belts. .A grinding wheel is mounted on the other end of said spindle by means of a collar 28. Said collar fits in a recess in wheel center 21 and holds said wheel and center on said spindle by means of a screw 28 passing therethru and threaded in said spindle.

The means for eflecting a reciprocating movement or the spindle i3 consists of an actuating spindle having a flange on one end and supported on spaced needle bearings 36 in a bore 31 in spindle I3. A cam 40 having an annular face is inserted in the inner. end of said actuating spindle 35 and heldin position by a pin 38. Between said cam and the bottom 01' said bore 'is a ball race 39 having an annular groove H. A ball 42 is held in said groove by the action oi. spring l6 urging pulley is and spindle l3 .to the right. Axial movement or said cam and actuating spindle to the right is limited by engagement between a bearing member 46 in actuating spindle 35 and abutment l3. Said abutment is mounted for self alignment on the spherical end I! of an adjusting screw 48 and secured thereon by a pin 43. Said screw in a bracket 50 on wheel base iii. A split nut clamping screw 52. Actuating spindle 35 is ro-' tated by means of a-grooved pulley secured by any suitable means to the flanged portion 01 said actuating spindle 35 Stepped pulley i3 and 'puliey 35 are both driven from driving pulley 2|; Pulley 55 has a diiierent diameter from either of the'stepped portions 0! pulley l9 so that there is a slightdiiierence-in'speed between spindle i3 and actuating spindle 35. This speed determines the rate of recipdiilerence in rocation of spindle l3.

For grinding against a shoulder. a roller II is provided engaging a shoulder 33 on spindle l3.

Said roller is eccentrically supported on .a ver- I is adiustably mounted screw 48 by means of tical axis in shaft I. Said shaft is rotatably supported in a portion 88 of wheel base II. A handle 68 is secured to a protruding end of shaft 61.

In Figures 3 and 4 is shown a form of our invention in which the reciprocating stroke may be adjusted. Instead of an actuating spindle mounted onjneedle bearings, a cylindrical member 15 rotatably supported in the bore 18 in spmdle Ill is used. Said bore provides the bearing surface for said cylindrical member. The inner end of said cylindrical member has a slot 1-1 to which a member 18 is pivotally attached by means of a pin I8. At the end of said bore is the ball race 38 with the annular groove 4| for ball 42.

' when the face of member 18 is parallel to race 39 as shown in Figure 4, there is no reciprocating movement. Any variation from this position about pin 19 would result in a reciprocating movement of a length depending upon the adjustment of said member. Such adjustment may be effected by means of a pair of rods Bil and 8| passing axially thru member 15 and engaging opposite portions of pivoted member II. The position of said member 18 may be adjusted by manipulating set screws 82 and 83 which effects adjustment of rods 80 and BI. The amount of adjustment may be indicated by graduations 84 on member 15 surrounding screw 82. If necessary, said rods and screws may be locked in any adjusted position by the use of lock screws in conjunction with said adjusting screws. Means for starting and stoppin spindle reciprocation with this form of our inventoin consists in a ring shaped member 85 having an annular cam surface 86. Said member is rotatably supported on a double row ball bearing 81 on member 15. A handle 88 having a hub portion 8! which serves as a cover for the end of member 15 is secured to said cam 86 by screws 90. In the center of said hub portion is an opening 9i thru which screws 82 and 83 may be reached for adjustment. A bracket 92 secured to wheel base l supports a roller 93 in contact with said cam surface 86.

Ball 42 and spindle 10 are urged to the right by a spring 85 on said spindle. One end of said spring engages the left hand bearing II, the other end engages a shoulder 96 on said spindle.

I Like spring IS in Figure 1, spring 95 serves to take up wear on the. thrust surfaces as well as to provide a part of the reciprocating movement of said spindle.

Another form of adjustable reciprocating mechanism is shown in Figure 6. In this form action of spring it since actuating spindle ll and cam I are held against axial movement by abutment it. As said ball moves toward-the low point of cam 40, spring ll urges pulley II and spindle to the right. The rate of reciprocation is determined by the difference in angular speed of the spindle II and race II, and the cam ill. The action of ball 41 rotating between cam II and race SI provides a further reduction of one-half in reciprocating speed.

To stop the reciprocating movement, abutment 4' is withdrawn. Spindle I3 is thus free to move to its extreme right hand position under the influence of spring ll.

The form of the invention shown in Figures 3 and 4 operates on the same principle as that shown in Figure 1. To start reciprocation, lever I8 is shifted so that the cam surface l6 rotating against the fixed roller 83 causes members I5 and Il to move to the left and in the position shown, to move spindle III in the same direction against the action of spring 85. As ball 42 moves toward the low portion of member 18, spring I! will shift spindle 10 to the right. To stop reciprocation, lever 88 and cam 88 are returned to their original position and the action of member 18 on ball 42 is such that said member along with member II is moved to the right to a point where it is no longer effective to impart a reciprocating movement to spindle It.

The extent of reciprocation is determined by the angle between the face of member. II and its axis of rotation. This may be adjusted from Iero to a predetermined maximum. Adjustment may be eifected by removing lock screws, and adjusting screws 82 and 83 in opposite directions, to effect a corresponding adjustment of rods II and BI. Member 18 is thus tilted to the desired position as indicated by graduations 84 around screw 82.

with the type of reciprocating device disclosed above, it is desirable that the rate of reciprocation shall vary directly with change in load. As the load increases the wheel slows down, the motor also slows down but by a smaller amount. The reciprocating mechanism will slow down only in proportion to the reduction in motor speed. The dliference in angular speed will be decreased and likewise the rate of reciprocation.

If it is desired to increase the rate of reciprocation with the increase in load, then a smaller pulley should be used on the reciprocating mechadjustable member I00 has a portion llil forming the inner race of a ball bearing The outer race I02 has a portion I03 which extends radially inward to provide a face portion. On the spindle 10, a member I04 has a protruding portion I05 which engages the face I03 of outer race I02.

, Operation In order to start the reciprocating movement of spindle i3, abutment 46 is adjusted by means anism than on the spindle. As the spindle slows down the reciprocating mechanism will also slow down but at a different rate. However, the difference in speed between the spindle and reciprocating mechanism will-be increased and likewise the rate of reciprocation.

If it is desired to start the reciprocating movement when the load reaches a certain point, the spindle pulley and the reciprocating mechanism pulley should be the same diameter. As soon as the spindle pulley slows down, the reciprocating mechanism pulley will slow down also but to a less extent. The difference in speed of the two parts will result in a reciprocating movement of the spindle. Y

We claim:

1. A grinding wheel mounting including a wheel support, a spindle rotatably mounted therein and means for drivingsame, a grinding wheel on said spindle, mechanism for effecting a reciprocating movement of said spindle including a member rotatable with said spindle, a second member rotatable at an angular speed differ. ing slightly from that of said spindle, one of said members having an operative surface perpendicular to its axis of rotation, the other of said members having an operative surface tilted at an angle to its axis of rotation, a rolling member adapted to move on said perpendicular surface in contact with said tilted surface, and means for adjusting the angle at which said surface is tilted.

2. A grinding wheel mounting including a wheel support, a spindle rotatably mounted therein and means for driving same, a grinding wheel on said spindle, mechanism for effecting a reciprocating movement of said spindle including a member rotatable with said spindle, a second member rotatable at an angular speed differing slightly from that of said spindle, one of said members having an operative surface perpendicular to its axis of rotation, the other of said members having an operative surface adjustably at tached thereto, means for changing the angle between said surface. and its axis of rotation including a pair of rods slidably mounted in said second memberand engaging said adjustable surface, and means for adjusting said rods.

3. A grinding wheel mounting including a wheel support, a spindle rotatably mounted therein, and means for driving same, a grinding wheel on said spindle, mechanism for effecting a reciprocating movement of said spindle including a member rotatable with said spindle, a second member rotatable at an angular speed differing slightly from that of said spindle, one of said members having an operative surface perpendicular to its axis of rotation, the other of said members having an operative surface adjustably attached thereto, means for changing the angle between said surface andits axis of rotation, including a pair of rods slidably mounted in said second member and engaging said adjustable surface, means for adjusting said rods, and means for determining the length of the reciprocating movement by indicating the extent of said adjustment.

4. A reciprocating mechanism for a grinding wheel comprising a support, a grinding wheel spindle rotatably mounted therein, means for rotating said spindle, a, member mounted for rotation independently of said spindle, means for rotating said member at a different angular rate than said spindle, a second member rotatable with said spindle, one of said members having a face perpendicular to its axis of rotation, the other member having a face at an angle less than 90 to its axis of rotation, a rolling member adapted to be rolled between said faces for effecting a relative reciprocating movement therebetween at a rate determined by the difference in-ang'ular speeds between the spindle and said first mentioned member, and means for'starting and stopping said reciprocating movement during rotation of said spindle.

5. A device of the typ set forth in claim 4 including means foryeffecting endwisemovement of one of said members toward the other whereby to initiate said reciprocating movement.

6. A grinding wheel mounting including a wheel base, a spindle rotatably mounted in bearings in said base, means for rotating said spindle, a member mounted for rotation independently of said spindle, means for rotating said member at a different angular rate than said spindle, an annular cam surface on one of said parts, connections between'said cam surface and said other part such that a relative .reciprocating movement is effected between said parts, and means for shifting one of said members axially 'for rendering said connections operative or inoperative.

7. A machine tool including, in combination, a rotatable element mounted for axial movement, a pulley in driving relation to said element, an

- additional pulley mounted adjacent to said first pulley and rotatable independently thereof, a

cam, a connection between said cam and one of said pulleys, means providing connection between said cam and said rotatable element such that the lement is moved in reciprocation following the shape of the cam, means for driving said pulleys at relative speeds for effecting rotation and reciprocation of said rotatable element, an abrading element actuated by said rotatable element in rotation and reciprocation, and means for rendering said second connection operative or inoperative for starting and stopping said reciprocating movement.

RALPH E. PRICE. HAROLD E. BALSIGER. 

